
RT9172
2
DS9172-14 March 2007
www.richtek.com
Typical Application Circuit
Functional Pin Description
Pin No.
RT9172F RT9172N RT9172S
RT9172-
CT
RT9172-
CM
RT9172-
CG
Pin Name
Pin Function
1
1
2
--
EN
Chip Enable (Active Hight)
2
2
1
1
VIN
Power Input Voltage
3
3
3
2
GND
Ground
4
4
5
3
VOUT
Output Voltage
5
--
--
--
FLG
ERROR Flag
--
5
4
--
SENSE
Remote Sense
Figure 1
VIN
EN
GND (TAB)
SENSE
VOUT
1
2
3
4
5
RT9172S- CT5
TO-220-5
1
2
3
4
5
EN
VIN
GND (TAB)
VOUT
SENSE/FLG
TO-263-5
RT9172N- CM5
RT9172F- CM5
1
2
3
4
5
VIN
EN
GND (TAB)
SENSE
VOUT
TO-263-5
RT9172S- CM5
1
2
3
4
5
EN
VIN
GND (TAB)
VOUT
SENSE/FLG
TO-220-5
RT9172N- CT5
RT9172F- CT5
VIN
GND
VOUT
RT9172-25
+
+
C
OUT
C
10uF
V
IN
= 3.3V
V
OUT
2.5V, 3A